ip	0	IP
icmp	1	ICMP
igmp	2	IGMP
ggp	3	GGP
ipencap	4	IP-ENCAP
st	5	ST
tcp	6	TCP
egp	8	EGP
igp	9	IGP
pup	12	PUP
udp	17	UDP
hmp	20	HMP
xns-idp	22	XNS-IDP
rdp	27	RDP
iso-tp4	29	ISO-TP4
xtp	36	XTP
ddp	37	DDP
idpr-cmtp 38	IDPR-CMTP
ipv6	41	IPv6
ipv6-route 43	IPv6-Route
ipv6-frag 44	IPv6-Frag
idrp	45	IDRP
rsvp	46	RSVP
gre	47	GRE
esp	50	IPSEC-ESP
ah	51	IPSEC-AH
skip	57	SKIP
ipv6-icmp 58	IPv6-ICMP
ipv6-nonxt 59	IPv6-NoNxt
ipv6-opts 60	IPv6-Opts
rspf	73	RSPF CPHB
vmtp	81	VMTP
eigrp	88	EIGRP
ospf	89	OSPFIGP
ax.25	93	AX.25
ipip	94	IPIP
etherip	97	ETHERIP
encap	98	ENCAP
pim	103	PIM
ipcomp	108	IPCOMP
vrrp	112	VRRP
l2tp	115	L2TP
isis	124	ISIS
sctp	132	SCTP
fc	133	FC